<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>
<body>
    <script src="../js/vue.js"></script>
    <div id ="app">
        <p>{{val}}</p>
    </div>
    
    <script>
        let app = new Vue({
            el:"#app",
            data:{ 
                val:"简单对象初始值",
                obj:{
                    name:"复杂对象name",
                    value:"复杂对象value",
                }
            },
            watch:{
                val:function(newval,oldval){
                    console.log(newval,oldval);
                },
                obj:{
                    deep:true,
                    handler:function(new_val,old_val){
                        console.log(new_val,old_val);
                    }
                }
            }
        })
    </script>
</body>
</html>